I've killed like 12 or more of these things tonight in 4hrs that I've been playing so far, along with greater skeletons, I'm lvl 12, dinged to 13 btw, only seen one ulna, one tibia two skulls, and two ribcages. Mostly dropping off the greater skeletons except for the ulna. Gonna stay all night till I get my second humerus bone...
Btw I didn't stay in one place, I started off at the camp site near lavastorm, then ran to the wizard spiers, then ran around near the ec zoneline using sense the dead locating greater skeletons then finally at the monolith right now...

Bone Chips
Calcified Ribcage
Calcified Skull
Calcified Ulna
Crude Adept's Cloak
Crude Adept's Cord
Crude Defiant Breastplate
Crude Defiant Buckler
Crude Defiant Chain Bracer
Crude Defiant Chain Leggings
Crude Defiant Cloth Pantaloons
Crude Defiant Cloth Robe
Crude Defiant Emerald
Crude Defiant Leather Bracer
Crude Defiant Leather Gloves
Crude Defiant Leather Trousers
Crude Defiant Plate Gauntlets
Crude Defiant Plate Helm
Crude Defiant Quarterstaff
Crude Defiant Ruby Shard
Iron Ore
Rusty Axe
Rusty Broad Sword
Rusty Halberd
Rusty Long Sword
Rusty Mace
Rusty Scimitar
Rusty Short Sword
Rusty Warhammer
Skeleton Parts
Splintering Club
Tacky Silk
Tattered Animal Pelt
Worn Great Staff